Technical Data

Reset Circuits with Manual Reset Input

Data Sheet N1594 Rev. -

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SSR811/SSR812

Description:

SSR811/SSR812 are low-power microprocessor (μP) supervisory circuits used to monitor power

supplies in μP and digital systems. They provide applications with benefits of circuit reliability and low

cost by eliminating external components. SSR811/SSR812 also offer a manual reset input.

These devices perform as valid singles in applications with Vcc ranging from 6.0V down to 0.9V. The

reset signal lasts for a minimum period of 140ms whenever VCC supply voltage falls below preset

threshold. Both SSR811 and SSR812 were designed with a reset comparator to help identify invalid

signals, which last less than 140ms. The only difference between them is that they have an active-low

R E SET

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output and active-high RESET output, respectively.

Low supply current (1μA) makes SSR811/SSR812 ideal for portable equipment. The devices are

available in SOT-23-5 package.

Features:

•

Ultra Low Supply Current 1μA(typ.)

•

Guaranteed Reset Valid to Vcc=0.9V

•

Available in two Output Types: Push-Pull Active Low (SSR811), Push-Pull Active High

(SSR812)

•

140ms Min. Power-On Reset Pulse Width

•

Internally Fixed Threshold 2.3V, 2.6V, 2.7V, 2.9V, 3.1V, 4.0V, 4.4V, and 4.6V

•

Tight Voltage Threshold Tolerance: 1.5%

•

Low Profile Package: SOT-23-5.

Applications:

•

Notebook Computers

•

Digital Still Cameras

•

PDAs

•

Critical Microprocessor Monitoring

Typical application circuit: